webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 99 insertions, 0 deletions

diff --git a/Source/WebCore/platform/gamepad/linux/GamepadDeviceLinux.cpp b/Source/WebCore/platform/gamepad/linux/GamepadDeviceLinux.cpp
new file mode 100644
index 000000000..c51754d54
--- /dev/null
+++ b/Source/WebCore/platform/gamepad/linux/GamepadDeviceLinux.cpp
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2012 Zan Dobersek <zandobersek@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ */
+
+#include "config.h"
+#include "GamepadDeviceLinux.h"
+
+#if ENABLE(GAMEPAD_DEPRECATED)
+
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <wtf/text/CString.h>
+
+namespace WebCore {
+
+GamepadDeviceLinux::GamepadDeviceLinux(String deviceFile)
+    : m_fileDescriptor(-1)
+    , m_connected(false)
+    , m_lastTimestamp(0)
+{
+    // FIXME: Log errors when returning early.
+    m_fileDescriptor = open(deviceFile.utf8().data(), O_RDONLY | O_NONBLOCK);
+    if (m_fileDescriptor == -1)
+        return;
+
+    char deviceName[1024];
+    if (ioctl(m_fileDescriptor, JSIOCGNAME(sizeof(deviceName)), deviceName) < 0)
+        return;
+    m_deviceName = String(deviceName).simplifyWhiteSpace();
+
+    uint8_t numberOfAxes;
+    uint8_t numberOfButtons;
+    if (ioctl(m_fileDescriptor, JSIOCGAXES, &numberOfAxes) < 0 || ioctl(m_fileDescriptor, JSIOCGBUTTONS, &numberOfButtons) < 0)
+        return;
+    m_axes.fill(0.0, numberOfAxes);
+    m_buttons.fill(0.0, numberOfButtons);
+}
+
+GamepadDeviceLinux::~GamepadDeviceLinux()
+{
+    if (m_fileDescriptor != -1)
+        close(m_fileDescriptor);
+}
+
+void GamepadDeviceLinux::updateForEvent(struct js_event event)
+{
+    if (!(event.type & JS_EVENT_AXIS || event.type & JS_EVENT_BUTTON))
+        return;
+
+    // Mark the device as connected only if it is not yet connected, the event is not an initialization
+    // and the value is not 0 (indicating a genuine interaction with the device).
+    if (!m_connected && !(event.type & JS_EVENT_INIT) && event.value)
+        m_connected = true;
+
+    if (event.type & JS_EVENT_AXIS)
+        m_axes[event.number] = normalizeAxisValue(event.value);
+    else if (event.type & JS_EVENT_BUTTON)
+        m_buttons[event.number] = normalizeButtonValue(event.value);
+
+    m_lastTimestamp = event.time;
+}
+
+float GamepadDeviceLinux::normalizeAxisValue(short value)
+{
+    // Normalize from range [-32767, 32767] into range [-1.0, 1.0]
+    return value / 32767.0f;
+}
+
+float GamepadDeviceLinux::normalizeButtonValue(short value)
+{
+    // Normalize from range [0, 1] into range [0.0, 1.0]
+    return value / 1.0f;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(GAMEPAD_DEPRECATED)